Slope-stake calcttlatoh



July 2 1927 w. D. STARRETT SLOPE STAKE CALCULATOR Filed July 25. 1923 3 Sheets-Sheet 1 INVENTOR WEIYflEL/h' 0. STHKRETI' BY 1 4 7 ORNEY ul 12 1927. 1635 646 J y. w. D. STARRETT SLOPE STAKE CALCULATOR Filed July 23. 1925 5 Sheets-Sheet 2 INVENTOR Wf/Yofl/D' D STFKREIT ATTORNEY July l2 1927.

I 1,635,646 w. o. STARRETT SLOPE STAKE CALCULATOR Filed July 2a. 1925 s sheets-Shea 5 INVENTOR WEIYDEL/IY 0- 5741??! TI a Patented July 12, 1927.

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I My invention is an improved calculator particularly useful in cross-sectioning or setting of slope stakes for .roadbeds, ditches,

and so forth. s

I The method of cross'sectioning is wellknown and consists of establishing the grade rod for the particular station to be crosssectioned, then subtracting this. grade rod from the surface vrod to give thecut or fill.

These calculations were done inentall and consequently there was quite a posaib' ity of error. Inditch work, twogrmde rods are used and the possibility of error is consequently increased. After the amount of cut II or fill has been determined, the position of I the slope stakeis determined by multipl ing the cut or fill by the rate of side slope (that is, l zl, 1:1. etc), and adding it to half the width of the roadbed. I

The object of my invention is to provide a calculator which will give the above. mentioned results with a single setting. The answer being given directly in feet and fractions of a foot. i

26 Another object of my invention is to provide a means whereb either a cut or a fill may be figured on t calculator. This is accomplished by-reversing the sequence of the figures in the outer disc. .I

c A still further ob ect is to provide a means wherebythe ran e of the calculator may be increased beyon the actual figures on the dials. I

In the annexed drawings I have illustrated as the preferred form of my invention, but it may also be embodied in other forms and figu in this application I desire to cover my invention in whatever form it may be embodied.

Referring to the drawings: Figure 1 is a plan view of my calculator. Figure 2 is a fragmentary dlagrammatic view of my calculator. I g

Fi ure 3 is a plan view of the range control isc. a

Figure 4 is a perspective View of one of the outer discs. Figure 5 is a plan View of the outer discs.

Referring more particularly to the drawing, my calculator consists three elements 1, 2 and 3, w ich may be termed the surface rod element, the grade rod and distance element, and the second grade rod and distance element, respectively. r The element 1 comprises two discs 4 and 5, each of which is formed as a spiral, and is rimarily of threaded one within the other. A scale 6 and 7 is placed upon the upper surfaces of the members 4 and 5 respectively, the scale 6. being arranged in increasing sequence clockwise, while the scale 7 is arranged in increasing sequence counter-clockwise. Tabs 8 and 9 are formed on the discs 4 and 5 respectively, whereby the sameare rotated. By means of these tabs the discs 4 and 5 may be manipulated so that the one covers the scale on the other, thereby leaving one of the scales 6 or 7 visible, according to the result desired, that is, a cut or a fill, which will be further explained.

The element 2 is formed with two superimposed dials 10 and 11, the former being I the upper and the latter being rot-atably V mounted below it. As shown, there are three scales upon the dials 10 and 11, the outer scale 12 being the grade rod, and the inner scales 13 being the distances from the edge of the bed to the toe of the fill or edge of cut. I have shown the scales 13 as slope rates of 1 1 and A :1 but any desired rate ma be used.

pertures 14 are formed in the dial 10 in the scales 12 and 13, through which the figures on the member 11 are visible. These apertures are spaced to indicate the feet, and the fractions of the foot are placed upon the member 10. As shown, there are twent main divisions on the discs, that is, the cal culator will read directly to twenty feet, if the cut or fill is greater than this the dial 11 is rotated under the dial 10 and a newset of res will appear under the apertures 14,

that is, from twenty to forty, or further from fort to sixty, and so forth, as far as desire The dial 11 is set in its position by means of a suitable lock 15, which consists of an arcuate rack 16 formed on the dial 10 and a finger 17 formed on the dial 11 which engages the various teeth in the rack16 and thus holds the member 11 in the desired po sition.

The inner element 3 has two dials 18'and 19 formed upon it. which indicate the second grade rod and the distance from the edge of the bank to the toe of the fill respectively. This is only used in ditch work where a bank is to be thrown up to form one or two sides of the ditch.

Theelements 1, 2 and 3 are all pivoted at their centers on a suitable pin 20. In Figures 1 and 2 I have shown two different settings for my calculator that in Figure 1 being for a cut and Figure 2 for a fin. Referring to Figure 1, after the instrument was set up it was found that the grade rod for that station was 15.5 feet, therefore l5.5

on the dial 12 is SBL- at the dnn rlc on; the disc 1.

The instrument is now set and no further settings are necessary. The surface rods are now read upon the scale (5 and the amount of cutis read upon the scale .12, and opposite this readin on the scales in is shown the distance from the edge of the road bed to the surface rod; that for a rod reading of dfeet the cut is iii) feet and the distance is Pl-3 feet for a slope nae of 1 4 11 or 2.8 feet for a rate of 4:11. it will be understood by one well versed in the art, that-a number of surface l'ifillilltf' mustbe taken oe"" ire edcje ol'ffhe cut is found and the s pe stake et. This naiurall is done in the usual wail.

Figure 2 i set for a fill and the scile T is exposed; uis lial ll has 'en}-1hifted to increase the range of the dis- 2 from i feet to ll) feet. The grade rod is feet which is set on the mark of t i nor a surface rod reaiiling of tilt is 38.5 feet and. the distan ljg'l' of the road lied to the rod i l'le'lerring n to higurc i if it is no- Sired to calcu 1e distance in ditch surveying. suppose the depth of the ditch is 4 feet, subtract T fronr the ado rod 15.3 which leaves 8.5 feet for the second grade rod on top of the bank. Now set on the dial l8 opposite Sit") on the scale (5 and the calculator is set. All readiin are read on the scale 6 and followed to toe elements 2- and 3 forthe results desired. i igyain for a rod reading of 10 feet on dial 3, the answer is out 1.5 feet, distance 235 feet, plus the constant distance which is com the center of the road to the edge of the bank.

Having described my invention, l claim: 1. In acalculator of the character described, a dial, and two discs presenting superimposed scales in adjacent relation to the (.lial the two discs being inter-related to allow either of the scales to be broughtinto View for reading with the dial.

2. in a calculator of the character described. a diahand two discs presentin superanv posed scales in adjacent relation to the dial, the scale on one of the discs being in reYerse sequence to that of the other and the two discs being inter-related to allow either of the scales to be brought into View for reading with the dial.

In a calculator of the character lescrihed, a dial and two rerolrablediscs prcsenting scales in adjacent relation to the tllill; the two discs being spiral and tln'mii'lcii one into the other so as to allow either of the scales to be brought into view for reading with the dial.

l. In a calculator of the character described, a dial and two revolvable discs prescnting scales in adjacent relation to the dial, thetwo discs being spiral and threaded one intothe other so as to allow either ol the scales to he brought into view for re-.:ding with the dial and the scale on one of the discs being in reverse sequence of that of the other.

.ln a calculator of the character de scribed, two superimposed spiral elements threaded into one another. each of thielenienls having a scale in reverse sci'pience of that of the other so as to allow either scale to be brought into VlOW hr a turning? niol ion.

6.111 a calculator of the character dei'zcribed, a dial formed with a -ircular series of spaced openings and a second dial. below the same and lOVOlVablG thereto having suecessive ranges of consecutive figures interrelated so that a new range of consecutive figures is presented to view through the openings in the first dial on each turning movement of a dial.

In testi1non whereof I affix my signature.

WENDELIN D. STARRETT. 

